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TV output unuseable
http://forums.linhes.org/viewtopic.php?f=2&t=18402		 Page 1 of 1
Author:  steptow [ Tue Jun 10, 2008 7:24 am ]
Post subject:  TV output unuseable
I am trying to move my combined BE/FE to a new location and using TV out from my ATI video card. I am using SVIDEO output to the TV. The boot sequence displays ok but when it changes to X the output changes to unintelligible as if the frequency is wrong. The TV format is PAL-B (Australia). If I control the system using VLC I can initiate Watch TV and the TV display seems to change. The sound is at this time is OK
I have edited xorg.conf in accordance with
http://www.knoppmythwiki.org/index.php? ... Transition
The fragment from xorg.conf is
Section "Screen"
Identifier "Screen0"
Option "TVStandard" "PAL-B"
Device "Card0"
Monitor "Monitor0"
DefaultColorDepth 16
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 32
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Any ideas or help appreciated
Author:  slowtolearn [ Tue Jun 10, 2008 12:05 pm ]
Post subject: 
Sounds similar to this post. Perhaps one of the suggestions there will help you out...
Author:  Girkers [ Wed Jun 11, 2008 2:33 am ]
Post subject: 
Whilst I don't have a direct answer, I think your res may be too high at 1024x768 some TVs can't handle that, so when you watch TV it is only 720x576.

Here are a couple of links that may be useful:
http://www.mythtv.org/wiki/index.php/ATI_Proprietary_Driver
http://www.kvaes.be/mythtv/the-unofficial-guide-to-getting-your-tv-out-working-on-an-ati-x1250/

Hope that helps. If you are in Brisbane I would be happy to call and help you out.
Author:  cliffsjunk [ Wed Jun 11, 2008 11:11 am ]
Post subject: 
Girkers wrote:
Whilst I don't have a direct answer, I think your res may be too high at 1024x768 some TVs can't handle that, so when you watch TV it is only 720x576.


You might try removing all the "1024x768"'s from the lines beginning with
'Modes'. The second problem is that these resolutions and other lines
may need to be tweaked for non-US resolutions/frequencies.

By the way, you should do your install starting by entering 'tv' at the
'boot:' prompt on the KnoppMyth install CD. That tells it that these high
resolutions are a no-no.

Cliff (USA)
Author:  steptow [ Thu Jun 12, 2008 7:11 am ]
Post subject: 
Thanks for your input. My xorg.conf now looks like this but unfortunately it is still showing scrambled output. I don't really want to re-install when I am not sure it will help.
Section "Device"
### Available Driver options are:-
# sw_cursor is needed for some ati and radeon cards
Option "sw_cursor"
#Option "hw_cursor"
#Option "NoAccel"
#Option "ShowCache"
#Option "ShadowFB"
#Option "UseFBDev"
#Option "Rotate"
Identifier "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
Driver "ati"
VendorName "All"
BoardName "All"
# BusID "PCI:1:0:0"
Option "TVStandard" "PAL-B"
Option "TVOut"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultColorDepth 16
SubSection "Display"
Depth 1
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 4
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 8
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 15
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 16
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 24
Modes "720x576"
EndSubSection
SubSection "Display"
Depth 32
Modes "720x576"
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection

I moved the TVStandard to the device section based on some input on one of the links. Any thoughts
Author:  cliffsjunk [ Thu Jun 12, 2008 10:17 am ]
Post subject: 
First off: Playing with timing values has been known to
actually fry TV's and monitors. I give this advice in good
faith, but I have not tested it myself and don't have full
knowledge of your hardware, so don't blame me if your
TV or monitor fries...

There is a thing called a 'modeline' that can be
put in xorg.conf that is probably a quick fix if you can find
the right one. This mode line tells it exactly what the timing
should be and overrides the default values that don't seem to
be working for you. I would google it or search the forums
here. There should be one to find as it is a standard PAL-B
TV set.

Here is what I found at: http://www.mythtv.org/wiki/index.php/Modeline_Database#PAL_625

Code:
# 702x576 @ 25Hz, 15.6kHz hsync, itu-r bt.470 PAL, analog broadcast
ModeLine "702x576@25i" 13.5   702 722 785 864  576 581 586 625 interlace -hsync -vsync

# 704x576 @ 25Hz, 15.6kHz hsync, itu-r bt.470 PAL, mpeg, 702 dots displayed
ModeLine "704x576@25i" 13.5   704 723 786 864  576 581 586 625 interlace -hsync -vsync

# 720x576 @ 25Hz, 15.6kHz hsync, ccir601 PAL, mpeg, 702 dots displayed
ModeLine "720x576@25i" 13.5   720 732 795 864  576 581 586 625 interlace -hsync -vsync

# 768x576 @ 25Hz, 15.6kHz hsync, square dot itu-r bt.470 PAL, TV-monitor, 767 dots displayed
ModeLine "768x576@25i" 14.75  768 789 858 944  576 581 586 625 interlace -hsync -vsync

# 768x576 @ 50Hz, 31.3kHz hsync, progressive square dot itu-r bt.470 PAL
ModeLine "768x576@50"  29.5   768 789 858 944  576 581 586 625 -hsync -vsync

# nonstandard PAL (Works with BOB deinterlace) It is 60Hz but works well with nVIDIA PAL-B TV-OUT
# Nvidia option: Option "TVStandard" "PAL-B"
ModeLine "720x576@60" 32.7  720 744 816 912  576 577 580 597

# This modeline is 50Hz interlaced and works well with kerneldeint:
ModeLine "720x576i" 13.875  720 744 808 888  576 581 586 625 -hsync -vsync interlace


Take this whole chunk and put it in your 'Monitor' section,
then try the resolution on each of your 'Modes' lines with
one of the values from each Modeline. You will change
all of your:
Code:
Modes "720x576"
with:
Code:
Modes "720x576i"
for instance. I would try the first
and last modelines from the looks of it.

I hear that the stock (no modeline needed) "800x600" mode
works well, even for PAL. I use it on my NTSC setups too.
Did you ever try that as it is what you would have tried if
you had just removed the "1024x768".

If you have an old 6+ gig hard drive you might try installing
a clean R5F27 on it to get some ideas like a new xorg.conf.
If you don't have an old hd, you might be able to back up
just your root partition (< 5 gig) onto a DVD or your /myth
partition (since you undoubtedly have more than 5 gig free
there), doing a test install using 'tv' (!! 'upgrade install' to
avoid wiping out your data!!) and restoring from the DVD
or /myth backup later.

Good luck,
Cliff
Author:  Girkers [ Thu Jun 12, 2008 6:43 pm ]
Post subject: 
Instead of a reinstall you could try an upgrade, the only problem being you would need to do a backup first. That being the case you would probably best connect a monitor to do the backup and then disconnect it to do the upgrade, remembering to put 'TV' at the boot prompt.
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